(PHP 7 >= 7.3.0)
gmp_perfect_power — Perfect power check
gmp_perfect_power ( GMP|int|string $num ) : bool
Checks whether num is a perfect power.
num
A GMP object, an int or a numeric string.
Returns true if num is a perfect power, false otherwise.
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https://www.php.net/manual/en/function.gmp-perfect-power.php